Derrick.



E. SWENSSON.

DERRICK.

AIPLIOATION FILED we. 20, 1910.

Patented Feb. 27, 1912.

a SHEETS-SHEET 1.

INVENTOR WITNESSES ATTORNEY IZO LUMBIA PLANODRAPH 60.. WASHINGTON. D c' vE. SWENSSON.

DERRICK.

APPLIOATION FILED AUG. 20, 1910.

. Patented Feb. 27, 1912.

3 SHEETS-SHEET 2.

f I I I I. 064 wwlxnomv COLUMBIA PIANOGRAPH CO" WASHINGTON.

E. SWENSSON.

DERRICK.

APPLICATION FILED AUG. 20, 1910. 1,018,529, Patented Feb. 27, 1912.

3 SHEETS-SHEET 3.

WITNESSES: IN VEN TOR ATTORNEY zoLuMBIA PLANDGRAPH c0..wAsHlNoToN, D. 6.

UNITED STATES PATENT OFFICE.

ERIC SWENSSON, F DULUTH, MINNESOTA, ASSIGNOR 0F ONE-HALF T0 NATIONAL IRON COMPANY, OF DULUTH, MINNESOTA, A CORPORATION OF MINNESOTA.

DERRICK.

Specification of Letters Patent.

Patented Feb. 27, 1912.

Application filed August 20, 1910. Serial No. 578,169.

- citizen of the United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in Derricks, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to improvements in derricks.

The object of my invention is to provide a derrick which might be termed a self con tained derrick, that is one in which the mast is preferably set at an angle, and the operating machinery carried by the mast, the latter being so supported as to'do away with stiff legs or guy ropes, thus applying all stresses directly to the foundation and admitting of the greatest possible latitude of operation.

Another object of my invention is to pro vide a more simple, cheap and effective derdick having certain details of structure and advantages hereinafter more fully set forth in the specifications.

In the accompanying drawings: Figure 1 is a side elevation of my improved derrick, showing the foundation in section. Fig. 2 is a similar view showing the derrick as applied to a scow. Fig. 3 is a transverse sectional view taken on the line 0aa2 of Fig. 1. Fig. 4 is a vertical cross section of a portion of the stationary foundation, and Fig. 5 is a plan view of same.

Referring now to the drawings, 1 represents a mast which is preferably built up of steel plates and angle bars and substantially rectangular in cross-section, although any other suitable construction could be used. The mast 1, as shown, is preferably set at an angle, or in other words, leaning, the object of which will be hereinafter more fully described. The lower end of the mast 1 is provided with a leg 2, which is formed at an angle to the mast or in a vertical position as clearly shown in Fig. 2, and thus the mast will at all times remain in aleaning position. The leg is rigidly carried by the mast and thus the mast and leg at all times assume their relative position to each other.

The mast 1 is provided with an enlarged base or bracket 3, to which is pivoted at 4 the boom 5. The boom 5 as shown, is pivoted to lean normally in a direction 0pposite or approximately opposite to that of the mast, and is operated vertically upon the pivot 4 by means of a cable 6 which passes over the block 7 and around the blocks 8 and .9 and by means of which the boom is raised or lowered. The opposite end of the cable passes around and is secured to a drum 10, which is operated by the engine, motor or other operating mechanism 11. A second cable 12 is secured to the drum 13 and operated by the mechanism 11, passing upwardly and over a sheave mounted upon the same shaft and similar to 7 and around the sheave 14, carried by the outer end of the boom 5,

and carries or passes around the operating or elevating block 15, carrying the usual hook 16 by means of which the article to be hoisted may be readily attached.

The mast l as shown, is provided at its rear edge with the platform 17, upon which is mounted the engine or motor and the oper ating drums 10 and 13, and which partly counterbalance the weight of the article being lifted by the boom, and the mast being set at an angle to the boom, also counterbalances the same, by which, together with my im proved form of mast support, I do away with the usual guy lines used in derricks of this character and apply all stresses to the foundation.

The foundation of my improved derrick consists of a circular pit 18, which is preferably built up of reinforced concrete and supported vertically by a similar construction of radially extending arms 30, forming a cross, as clearly shown in Figs. 4 and 5. There may be a greater or less number of these reinforced arms as the work of the derrick may require, but the cruciform arrangement shown in the drawings has proved in practice very efficient and economical, the reinforcing rods 31 extending from the extreme end of one arm to that of the opposite arm and passing beneath the bottom of the pit. Within the pit 18 and near the bottom thereof, is a metal bearing ring 19 which is designed to engage the circular bearing plate 20 carried by the lower end of the leg 2 of the mast.

To the curb of the pit 18 is securely at tached the large circular gear rack 25, having an inner depending circular bearing ring 22, which snugly fits within the upper wall of the pit and corresponds in construction to the bearing ring 19, and engages the bearing 23 which is rigidly carried by the upper end of the leg 2 of the mast. These bearing rings are made large and sufficiently strong to withstand any lateral stress coming upon them through the manipulation of the derrick and its load.

To the base of the leg 2 of the mast, is securely attached the male pivot casting 23, which engages the female casting 24: fixed within the bottom of the pit and which carries the weight of the derrick and admits of a free revolving of the same.

The bracket 3 comprising the base of the mast carries a vertical shaft 26 to' the lower end of which is secured a pinion 27 meshing with the gear 25 and the rotation of the pinion causes the derrick to travel around the gear 25. The upper end of the shaft 26 is journaled in the platform 17 and is driven by the engine or motor in any desired manner.

While I have shown the supporting mechanism or leg of the derrick arranged within a pit, it is evident that the same results may be accomplished in many other ways without departing from the spirit of my invention, for instance, when applied to a scow, as shown in Fig. 2, the upper supporting bearing may be in the deck 28 and the lower bearing 29 in the bottom of the scow and suitably braced in the framing thereof. It is also evident that a similar construction could be applied to a car or truck which would provide an extremely simple form of portable derrick.

From the foregoing it will be seen that I have provided a simple and strong derrick and one that is capable of the greatest possible reach and efliciency, being readily operated from extreme vertical to extreme horizontal position without special adjustment and having no stiff-legs or guy-ropes whatever.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A derrick comprising a leaning mast, a boom pivotally mounted upon the mast and extending in a direction opposite to the angle of the mast, and operating machinery wholly supported by the mast on the opposite side from the boom. V

2. A derrick comprising a leaning mast, vertically pivoted within a suitable base, a boom pivotally mounted upon the mast and extending in a direction opposite to the angle of the mast, and operating machinery wholly supported by the mast a considerable distance above the base and operating the mast and boom.

3. A derrick comprising a leaning mast vertically pivoted within a suitable foundation, a boom pivotally mounted upon the mast and extending in a direction opposite to the angle of the mast, and a horizontal platform wholly supported by the mast a distance above the foundation and extending from the opposite side to that of the boom, and operating mechanism supported by the platform and adapted to rotate the mast and raise and lower the boom.

4. A derrick comprising a leaning mast having a vertical leg at its lower end rotatably supported in a pit, a boom carried by the mast and extending in a direction opposite to that of the mast and means carried by the mast on the opposite side from the boom for operating the mast and boom.

5. A derrick comprising a leaning mast, having a vertical leg at its lower end rotatably supported in a pit, a boom carried by the mast and extending in a direction opposite to that of the mast, and means carried by the mast on the opposite side from the boom for rotating the leg in the pit and operating the boom.

6. A derrick comprising a leaning mast, having a vertical leg at its lower end, ex tending within a pit, bearing rings carried by the upper and lower ends of the pit, circular bearings carried by the leg bearing against said rings, a large gear carried by the pit, a pinion carried by the mast and meshing with said large gear, and means carried by the mast for operating said pinion and raising and lowering said boom and raising and lowering a block carried by the end of the boom.

7. A derrick comprising a leaning mast, having a vertical leg at its lower end and extending into a pit, bearing rings carried by the upper and lower'ends of the pit, circular bearings carried by the leg and bearing against the rings, a boom carried by the mast, an enlarged gear carried by the pit and surrounding the same, a pinion carried by the mast and meshing with said gear, a platform carried by the mast on the opposite side from the boom and means carried by the platform for operating said pinion and raising and lowering a block carried by the end of the boom.

8. A derrick comprising a leaning mast, a boom pivoted to the mast and leaning in the opposite direction to the mast, the mast having a vertical leg at its lower end and extending into a pit, bearing rings carried by the sides of the pit, a female bearing carried by the bottom of the pit, circular bearings carried by the sides of the leg and bearing against the rings, a male bearing carried by the lower end of the leg and entering the female bearing in the pit, a platform carried by the mast on the opposite side from the boom, a shaft rotatably mounted in the platform, a pinion carried by the lower end of the shaft and meshing with the stationary gear and means carried by the platform for rotating the said shaft and raising and lowering the boom and raising and lowering the block carried by the boom.

9. A derrick comprising a leaning mast vertically pivoted within a suitable foundation, a boom pivotally mounted upon the mast and extending in a direction opposite to the angle of the mast, and operating machinery carried by the mast 0n the opposite side to that of the boom.

10. A derrick comprising a mast having a vertical leg at its lower end and extending Within a pit, bearing rings carried by the upper and lower ends of the pit, circular bearings carried by the leg, bearing against the rings, a boom carried by the mast and operating means carried by the mast on the opposite side to that of the boom.

11. A derrick comprising a mast having a vertical leg at its lower end rotatably supported within a pit, a plurality of radially disposed arms supporting the pit, a boom carried by the mast and means for operating the boom, mast and load.

12. A derrick comprising a mast rotatably carried within a pit, a boom pivotally carried by the mast, radial arms supporting the pit, reinforcing rods extending from the outer end of one arm to the outer end of the opposite arm and crossing beneath the pit and means for operating the derrick.

13. A derrick comprising a leaning mast having a vertical leg at its lower end and rotatably supported in a pit, a boom pivotally carried by the mast, means carried by the mast on the opposite side of the derrick for rotating the boom and leg and operating the boom and the lifting mechanism carried by the boom.

14. A derrick comprising a leaning mast having a vertical leg at its lower end rotatably supported in a pit, a boom carried by the mast and extending in a direction opposite to that of the mast, a platform carried by the mast above the connection of the boom, and means carried by the platform rotating the leg in the pit and raising and lowering the mast and operating the lifting mechanism carried by the boom.

15. A derrick comprising a leaning mast, a boom pivotally carried by the mast and extending in a direction opposite that of the mast, a platform carried by the mast above the connection with the boom and means carried by the platform for rotating the mast and raising and lowering the boom and operating the lifting mechanism carried by the boom whereby the weight of said mechanism counterbalances the weight of the boom and the weight on the boom.

16. A derrick comprising a leaning mast, having a vertical leg at its lower end, ex-

tending within an opening bearing rings within the upper and lower ends of the opening, circular bearings carried by the leg bearing against said rings, an enlarged gear rigidly supported, a pinion carried by the mast and meshing with said gear, and means carried by the mast for operating said pinion and raising and lowering saidboom and raising and lowering a block carried by the end of the boom.

17. A derrick comprising a leaning mast, having a vertical leg at its lower end and extending into an opening, bearing rings within the upper and lower end of the opening, circular bearings carried by the leg and bearing against the ring, a boom carried by the mast, an enlarged gear rigidly supported above the pit and surrounding the same, a pinion carried by the mast and meshing with said gear, a platform carried by the mast on the opposite side from the boom and means carried by the platform for operating said pinion and raising and lowering a block carried by the end of the boom.

18. A derrick comprising a leaning mast, a boom pivoted to the mast and leaning in the opposite direction to the mast, the masthaving a vertical leg at its lower end and extending into an opening, bearing rings within the opening, a female bearing carried by the bottom of the opening, circular bearings carried by the side of the leg and bearing against said rings, a male bearing carried by the lower end of the leg and entering the female bearing in the opening, a gear rigidly supported and surrounding the opening, a platform carried by the mast on the opposite side from the boom, a shaft rotatably mounted in the platform, a inion carried by the lower end of the shaft and meshing with the stationary gear and means carried by the platform for rotating the said shaft and raising and lowering the boom and raising and lowering a block carried by the boom.

19. A derrick comprising a mast having a vertical leg at its lower end and extending within an opening, bearing rings within the upper and lower ends of the opening, circular bearings carried by the leg, bearing against the rings, boom carried by the mast and operating means carried by the mast on the opposite side of that of the boom.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

ERIC SWENSSON. Witnesses H. WV. COFFIN, S. GEO. STEVENS.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

